While that number doesn't reveal the OS version (8107), reading the new features and fixes reveals that indeed it has to be 8107 since it fixes the disappearing keyboard. Here are the new fixes and enhancements:

Improved Voice Mail notifications when traveling outside the U.S.

Enhanced Cellebrite contact transfer performance.

Improvements in keyboard performance prevent keyboard from disappearing while typing.

Original messages will be included when replying or forwarding an email via an Exchange 2003 server.

Improvements in text messaging performance

No word on exactly when this update will begin being pushed but seeing as Verizon is coming forward with the details, we're going to say it's imminent. So good new for you Verizon folks, not so great news if you're on AT&T or Sprint.